EP1908225A1 - Verwaltung eines lokalen netzwerks - Google Patents

Verwaltung eines lokalen netzwerks

Info

Publication number
EP1908225A1
EP1908225A1 EP06736707A EP06736707A EP1908225A1 EP 1908225 A1 EP1908225 A1 EP 1908225A1 EP 06736707 A EP06736707 A EP 06736707A EP 06736707 A EP06736707 A EP 06736707A EP 1908225 A1 EP1908225 A1 EP 1908225A1
Authority
EP
European Patent Office
Prior art keywords
clients
local area
managing
area network
server
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06736707A
Other languages
English (en)
French (fr)
Inventor
Niall Seamus Mcdonnell
Richard Krull
Daniel Bame
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1908225A1 publication Critical patent/EP1908225A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/18—End to end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/19—Flow control; Congestion control at layers above the network layer
    • H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2416—Real-time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/25—Flow control; Congestion control with rate being modified by the source upon detecting a change of network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]

Definitions

  • the present invention relates generally to local area networks (LANs) and, more particularly, to local area network management.
  • a sequence of events/conditions can often occur that causes glitches in the delivery of video over the network.
  • Ethernet switches typically used in LANs do not provide end-to-end flow control for traffic on the Ethernet level.
  • TCP Transmission Control Protocol
  • TCP traffic can cause stalls in normal traffic patterns.
  • routers and switches may drop frames on occasion. The dropping of Ethernet frames will result in the use of error recovery functions by TCP. TCP error recovery may cause stalls in the video stream, causing glitches in the video delivery system.
  • NAS Network Attached Storage
  • I/O Input/Output
  • Ethernet transport layer
  • switches may drop packets due to traffic congestion policies.
  • LAN local area network
  • LAN local area network
  • a method for managing a Local Area Network (LAN) having at least one video server in signal communication with a plurality of clients includes providing a lossless Transmission Control Protocol/Internet Protocol (TCP/IP) Virtual Local Area Network (VLAN) fabric within the LAN.
  • the method further includes providing a shared file system on the at least one video server.
  • the method includes deterministically managing isochronous access to the shared file system on the at least one video server by the plurality of clients, over the VLAN fabric, utilizing at least one Internet Small Computer System Interface (ISCSI) block protocol, to provide lossless delivery of video applications from the at least one video server to any of the plurality of clients without invoking TCP error recovery mechanisms.
  • ISCSI Internet Small Computer System Interface
  • FIG. 1 depicts a high-level block diagram of a local area network in accordance with one embodiment of the present invention.
  • FIG. 2 depicts a flow diagram of a method for managing a local area network (LAN) in accordance with one embodiment of the present invention.
  • the present invention is directed to managing a Local Area Network (LAN) having at least one server and a plurality of clients using Internet Small Computer System Interface (ISCSI) to provide deterministically managed isochronous access to video applications on a server by clients.
  • the clients are provided with lossless delivery of video applications from the server without invoking Transmission Control Protocol (TCP) error recovery mechanisms.
  • TCP Transmission Control Protocol
  • any element expressed as a means for performing a specified function is intended to encompass any way of performing that function including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function.
  • the invention as defined resides in the fact that the functionalities provided by the various recited means are combined and brought together in the manner for which the invention calls. It is thus regarded that any means that can provide those functionalities are equivalent to those shown herein.
  • LAN local area network
  • Some of the many attendant advantages/features of LAN management as described herein include, but are not limited to, low latency, the avoidance of dropped frames, and the providing of end-to-end flow control through the LAN.
  • the present invention advantageously allows an Ethernet LAN, running Internet Small Computer System Interface (ISCSI), to provide similar features for storage as a Fiber Channel Small Computer System Interface (FC-SCSI).
  • ISCSI Internet Small Computer System Interface
  • FC-SCSI Fiber Channel Small Computer System Interface
  • the present invention provides, among other features described herein below, uninterrupted traffic flow throughout the LAN.
  • FIG. 1 depicts a high level block diagram of a Local Area Network (LAN) 100 in accordance with an embodiment of the present invention.
  • the LAN 100 includes a plurality of clients 110 connected to a server 120 having a server storage element 125.
  • the LAN 100 can include switches 190 and hubs (not shown) for interconnecting the various elements such as the clients 110 and the server 120.
  • the plurality of clients 110 are connected to the server 120 over a Genet Fabric utilizing two VLANs 160 and 170.
  • one of the two VLANs is used for media data and the other one of the two VLANs is used for control data. In this way, network traffic can be segregated to provide uniform traffic patterns within the LAN 100.
  • FIG. 2 depicts a flow diagram of a method 200 for managing a local area network, such as the LAN 100 of FIG. 1 , in accordance with one embodiment of the present invention. Accordingly, the method steps will refer to the elements of the LAN 100. Of course, given the teachings of the present invention provided herein, the method 200 may be applied to other LANs having other configurations, while maintaining the scope of the present invention.
  • a lossless Transmission Control Protocol/Internet Protocol (TCP/IP) fabric is established within the LAN 100.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • the lossless TCP/IP fabric provides a medium such that TCP error correcting mechanisms are not invoked, thereby providing the underpinnings of a data communication system having low latency and deterministic behavior.
  • step 205 may include one or more of the following steps 210-225 to support the lossless TCP/IP fabric.
  • one or more Virtual Local Area Networks may be formed within the LAN 100 for segregating application traffic on the VLANs based on traffic type to provide uniform traffic patterns.
  • a first set of VLANs (having one or more members) can be configured for use with isochronous traffic (e.g., media data), and a second set of VLANs (having one or more members) may be configured for use with control data.
  • any switches/hubs within the LAN can be configured to have a first setting for the isochronous traffic and a second setting for the non-isochronous traffic, the settings being used for directing the network traffic to the appropriate VLAN.
  • the ingress rate and/or the egress rate of buffers or any other storage devices in the server 110, the plurality of clients 120, the switches 190, hubs, and so forth are deterministically managed.
  • the flow control function of any element(s) of the LAN 100 may be used to manage the ingress rate and/or the egress rate of that element or another element(s), for example, utilizing a
  • backpressure signal from a device having or about to have an overflow condition.
  • indications can be provided to a transmitting device, of a current or an imminent overflow condition in a receiving device, wherein the transmitting and receiving devices can be any elements of the LAN 100.
  • the size of the Transmission Control Protocol (TCP) window of each of the plurality of clients 120 may be limited to constrain the amount of data capable of being sent therefrom.
  • the TCP window is constrained such that the product of the TCP window size and the number of the plurality of clients (illustratively three in FIG. 1) does not exceed a bandwidth or other data passing capability of any data passing element within the LAN 100 (including the clients 110, the server 120, and any switches or hubs).
  • the method 200 then proceeds to step 250.
  • the lossless TCP/IP fabric is configured as a scalable deterministic ISCSI system to deliver isochronous support for ISCSI traffic. It is to be further appreciated that step 230 may include one or more of the following steps 255-270 to support the isochronous delivery of ISCSl traffic.
  • a shared file system is provided for the server 120 and the plurality of clients 110.
  • the plurality of clients 110 can be configured as ISCSI initiators and the server 120 may be configured as an ISCSI target.
  • the ISCI target i.e., the server 120
  • the server 120 can be configured to include a dedicated buffer pool.
  • the ISCSI traffic may be segregated onto the lossless TCP/IP VLANs to provide uniform traffic patterns.
  • all isochronous traffic may be directed to the first set of VLANs, and all non-isochronous traffic may be directed to the second set of VLANs.
  • the non-isochronous traffic may include, for example, the control data.
  • the lossless TCP/IP fabric is provided and configured such that TCP error recovery mechanisms are suppressed (not invoked). In this way, stalls in the delivery of video applications due to the TCP error recovery mechanisms are avoided.
  • TCP is a reliable delivery protocol and, as such, if the underlying fabric drops packets in transmission, TCP will invoke error recovery retry policies to ensure the data arrives at the destination. If a switch in a fabric has a port with many clients bursting large amounts of data to that port, then the carrying capacity of that port may be exceeded. Ethernet fabric switches implement a congestion control policy by throwing away Ethernet packets when a port's buffer is over-run. This forces TCP error recovery to be invoked. The TCP protocol will detect this missing packet and retry at a later time. If congestion continues, packets will continue to drop and TCP will limit the performance of the transfer and may fail the transfer. TCP error recovery algorithms can reduce bandwidth and severely impact latencies and determinism. A system desiring low latency and deterministic behavior must protect against invoking the TCP error recovery algorithms.
  • ISCI is utilized instead of NAS to provide an overall system having end-to-end flow control.
  • a lossless flow of video data may be achieved from the server 120 to any of the plurality of clients 110 with lower latency and with end-to-end flow control as compared to NAS.
  • Typical NAS client server protocols add additional layers of buffering on both the client and the server. Applications that use those protocols do not control the client buffering characteristics nor the servers buffering/flushing characteristics.
  • the NAS server is an IT server that is tuned for sequential access. If an application has isochronous requirements, yielding control to buffering characterization on both the client and server will yield inefficiencies. For example, if the application involves fast forward to fast reverse through material for a video effect, typical NAS file-servers are not designed to respond efficiently.
  • SCSI block traffic is a low latency protocol that is capable of transferring data quickly, with no intermediary layers.
  • SCSI block protocols coupled with a shared file-system in accordance with the present invention, yields low latencies and control of buffering policies throughout the data flow paths.
  • Running SCSI block protocols over Genet requires implementation of the ISCSI protocol, which is a SCSI block protocol implemented over TCP/IP.
  • an integrated ISCSI bridge is utilized, and may be employed with a dedicated buffer pool in the server 120, to provide efficient, responsive SCSI block processing over the fabric.
  • the clients are configured as ISCSI initiators and the server is configured with ISCSI target capability.
  • data segregation and directed traffic flow based on traffic type are utilized to provide isochronous and deterministic transfers within the LAN.
  • traffic type For example, in typical IT fabric environments there are many applications moving data, each with their own I/O characteristics. These disparate data flows tend to interfere with predictability.
  • isochronous and deterministic transfers in accordance with the present invention, all isochronous traffic is directed onto one VLAN, and any other kinds of traffic should not be permitted on that VLAN. In this way, a uniform traffic pattern is obtained. There should be no unknown application or unknown device bursting large amounts of data without constraints. 6 007433
  • control of the TCP window size is used on the clients to limit the amount of traffic that can be burst at one time from each client.
  • TCP does supply an end-to-end flow control mechanism and can support lossless transfers, absent failed hardware and with sufficient buffer management provided in the fabric to handle the worst case burst from all clients simultaneously.
  • TCP traffic can burst a limited amount of data before an acknowledgement is received from the destination; this is referred to as the TCP Window Size. Without receipt of an acknowledgement, the transfer will stop once the Window Size has been sent. Limiting the TCP window size on the clients limits the amount of traffic that can be burst at one time from each client.
  • switches may be selected that allow VLAN management, with flow-control capability and with deep buffers at the ports.
  • VLAN management allows traffic segregation so that all ISCSI traffic can be isolated on its own VLAN.
  • Enabling flow-control allows the switch port, when receiving data, to provide back-pressure to a sending NIC when the switch input port buffer reaches a threshold.
  • Deep buffers on the switch ports should support the TC Window Size multiplied by the number of clients sharing the port buffer.
  • NICs with flow control capability may be selected to provide back pressure to the switch if necessary and with the ability to configure reasonable resources to handle bursty transfers.
  • Devices that provide good internal performance should be selected so that the TCP data flow is not constrained by the internal architecture of the hardware or software, for example, all end points, initiators or targets, can run at full fabric speed when in operation.
  • the teachings of the present invention are implemented as a combination of hardware and software.
  • the software is preferably but not necessarily implemented as an application program and/or drivers tangibly embodied on a program storage unit.
  • the application program and/or drivers may be uploaded to, and executed by, a machine comprising any suitable architecture.
  • the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU"), a random access memory (“RAM”), and input/output ("I/O") interfaces.
  • CPU central processing units
  • RAM random access memory
  • I/O input/output
  • the computer platform may also include an operating system and microinstruction code.
  • the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or part of a driver, or any combination thereof, which may be executed by a CPU.
  • various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Small-Scale Networks (AREA)
EP06736707A 2005-07-26 2006-03-02 Verwaltung eines lokalen netzwerks Withdrawn EP1908225A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70244105P 2005-07-26 2005-07-26
PCT/US2006/007433 WO2007018599A1 (en) 2005-07-26 2006-03-02 Local area network management

Publications (1)

Publication Number Publication Date
EP1908225A1 true EP1908225A1 (de) 2008-04-09

Family

ID=36337550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06736707A Withdrawn EP1908225A1 (de) 2005-07-26 2006-03-02 Verwaltung eines lokalen netzwerks

Country Status (7)

Country Link
US (1) US20090094359A1 (de)
EP (1) EP1908225A1 (de)
JP (1) JP5065269B2 (de)
CN (1) CN101233726B (de)
BR (1) BRPI0613647A2 (de)
CA (1) CA2615145A1 (de)
WO (1) WO2007018599A1 (de)

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Also Published As

Publication number Publication date
CA2615145A1 (en) 2007-02-15
JP2009503997A (ja) 2009-01-29
JP5065269B2 (ja) 2012-10-31
CN101233726B (zh) 2012-10-31
CN101233726A (zh) 2008-07-30
WO2007018599A1 (en) 2007-02-15
BRPI0613647A2 (pt) 2011-01-25
US20090094359A1 (en) 2009-04-09

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